Electric-circuit breaker



ELECTRIC CIRCUIT BREAKER Filed April 1, 1927 I J9 0 .n 33

4 1 us; 5 I

ii 3 3K1 E J; i d 42 l 1/ lim l 2 .ll Ill & .35 I a) 19 @f R 15" 5% L 1a ry/ K v I Z I T15 16 I kg 42? 1,647,010 G. s. MARSTON Patented a. 25,1927.

1 UNITED stares 1,647,010 arrar arries;

GORDON srnuonrt ranusron, on wnsrrvrrrrsrua, Ens-LAND.

EL C IC-erasure snnarrnu.

T Apphcation filed April 1, 1927, Serial No. iao,21a, and in GreatBritain April 12; 1926.

This invention has relation to electric cir-- cultbreakers or switchesand it has for its" object" the provision of improvements by means ofwhich certain advantages shall be obtained.

. be made to the embodiment illustrated, to some extentdiagrammatically, on the accompanying sheet of drawings.

Fig. 1 is a viewshowing the parts of the mechanism in the positions theyoccupy whenthe circuit breaker is closed.

mechanism" in' the positions "they occupy when the circuit breaker hasjust been opened.

Figs. 3, 4 and 5 are detail views and show parts of the mechanism indifferent posi tions and-to a larger scale than Figs. 1 and 2.

11 is a casing in which the parts of the circuit breaker are containedand mounted. 12 is a frame or standard mounted on the back wall of thecasing 11 and in which a pair of arms 13 is pivotally mounted on a.

pin 14. The arms 13 are connected toget-her at their one end by a springor springs 15 and by the members of a toggle 16 and at their other endscarry contact making and breaking members 17 that cooperate with fixedcontacts 18 mounted on the side walls of the casing 11 and to which theelectric leads 19 are connected. The spring 15 tends to maintain thearms 13 in positions in which the contact making and breaking members 17are out of contact with the contacts 18. The frame 12 has a longitudinalslot 20 with which the knuckle pin 21 of the toggle 16 engagesand bywhich it is guided. 22 is a push-pull rod mounted in a bearing 23 andextending to the outside of the casing 11. The bearing 23 is itselfmounted on one of the end walls of the easing 11 and has a longitudinalslot 24 with which a pin 25 on the rod 22 engages. The rod 22 is thusconstrained to rectilineal movement only. The free or inner end of therod 22 is recessed and on this portion a pair of arms 26 is pivotallymounted on a pin 27. The one end of each of the arms 26 is hooked asindicated at 28. The arms 26 are sub'ect to the action of a spring 29which ten s to cause the hooked ends 28 to overlap. 30 is a sleeveloosely mounted on the rod and. constrained as hereafter I trippingdevice.

. j strained against'rotarv motion. Fig. 2 is a view showing the partsof the sleeve 30 is adapted to co-operate withand actuate the arms "26.32 is a no volt' release coil and 33 is the coil of an overload 34 is alever pivotally mounted on a bracket 35. The rod 22 passes through thelever 34 and the hole 36fprovide d for this purpose is such that an ex-181131011 '31 on the sleeve 80 can also pass therethrough. The hole 36is'further such that by reason of the engagement of the ex tension 31therewith the sleeve30 is re- The operation is as follows 1 .The circuitbreaker is open at which time the contact makmg and breakingmembers .17,arm's-13 ,toggle 16 and spring or springs 15 are in the position shownin Fig. 2 and the hooked ends 28 of the arms 26 are in engagement withthe knuckle pin 21 of the toggle 16. To close the circuit breaker,'therod 22 is pulled outward and through the hooked arms 26 causes theknuckle pin 21 to travel along the slot 20 of the frame. 12. The membersof the toggle 16 are thus moved into line and the arms 13 are moved tobring the contact making and breaking members '17 into contact with thecontacts 18. The arms 26 and toggle 16 now occupy the positions shown inFig. 3. The circuit breaker is now closed and will so remain until therod 22 is pushed inward or the device controlled by the coil 32 or thecoil 33' is actuated. WVhen the rod 22 is pushed in ward its free end 40comes into contact with the'knuckle of the toggle 16 as shown in Fig. 4.When this happens, the toggle 16 is broken the spring 15 acting on andmoving the arms 18 in directions to separate the contact making andbreaking members 17 and contacts 18. If one of the devices controlled bythe coil 32 or 33 become operative, the lever 34 is rocked to theposition shown in Fig. 4, and acts on the sleeve 30 to move it endwise.The sleeve 30 during this movement acts on the arms 26 and causes theirhooked ends 28 to move apart clear of the knuckle pin 21 of the toggle16 as shown in Fig. 4. The movement of thesleeve 30, when the arms 26are fully separated, is also imparted to the rod 22 and its end 40 iscaused to contact with the knuckle of the toggle 16 which is therebybroken as before. The circuit breaker can be reset by inward movement ofthe rod 22, thereby the lends of the arms 26 aagag e the makingandebreakingmembers. and means tov 1 make -andbreak the toggle and. tomove; the ;.armsjto;close or openthe circuits. 1

,2. A. circuit breaker comprising a pair of arms pivoted on a commonpin, and each carrying at one end .a contact making and breaking member,toggle mechanism and spring means connecting the other ends of saidarms, fixed contacts to ,co-operate' with :said contactmaking andbreaking members, a push-pullrod and :a pair of arms pivot- -5allyimounted ongsaid rod on a common pin and having hooked ends to engage theknuckle pin of the toggle.

' "I3. Ajcircuit breaker comprising a pair of arms pivoted on a commonpin, and each carrying at one .end a contact makingand breaking member,toggle mechanism and spring means connecting the other ends of saidarms, fixed contacts to co-operate with said contact making and breakingmembers, a push-pull rod, a pair of arms pivotally mounted onsaid rod ona common pin and having hooked ends to engage the knuckle pin of thetoggle andmeans onsaid pushpull rod to open the circuit breaker.

4. A- circuitbreaker comprising apair of arms pivoted on a common pin,and each :carrying at one end a contact making and breaking member,toggle mechanism and spring means connecting the otherends of said.-arms,, fixed contacts to. co-operate with saidcontact makingandbreaking members,

I a push-pull rod, a pair of arms pivotally .,monnted on'said-rodon acommon pin and having hooked ends to engage the knuckle .pin of thetoggle, and endwise movable sleeve on said push-pull'rod to open saidhook ended arms and means toactuate said sleeve.

'Datedth'is'lOth day of March, 1927.

GORDON MARSTQN.

